I've had DCIS twice, but had my ovaries removed before I was ever diagnosed, so I haven't faced this decision. Do you currently have DCIS or have you already been treated? Will your doctor allow you to use HRT if you have your ovaries removed?
The symptoms of surgical menopause can be fairly severe. Some women do OK without HRT, but many don't. If you are concerned that your DRs may not be willing to prescribe HRTs for you if you have the ovaries removed, I'd keep them, assuming you don't have any problems with them.
The first oncologist I saw after my first DCIS diagnosis insisted that I get off my HRTs and start on Tamoxifen. When I asked her, if I still had working ovaries, would you be telling me to have them removed? she responded "of course not". (I tried cutting my HRT dose in half and going on Tamoxifen to humor her, lasted less than one week before my other DRs insisted I get off the Tamoxifen and go back to my regular HRT dose because the symptoms were so severe I couldn't function.)
There are some links in our Resource Links directory to good information on hormones and breast cancer; you may want to check them out. Also, when you get a minute, if you can put your surgery date into your profile, you'll be able to post in our Post Op forum once you've had the surgery.
Best of luck with whatever you decide to do.